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Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.32, 8.2.0 - 8.2.28, 8.3.0 - 8.3.19, 8.4.1 - 8.4.5
Array ( [2] => Array ( [0] => 4 [1] => 5 ) [3] => Array ( [0] => 7 [1] => 8 [2] => 10 ) )
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
Fatal error: Uncaught Error: Call to undefined function array_key_first() in /in/H20VB:10 Stack trace: #0 {main} thrown in /in/H20VB on line 10
Process exited with code 255.

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